Color

Color is the visual perceptual property corresponding in humans to the category called red, yellow, white, etc. Color derives from variety of light distribution of light energy versus wavelength interacting in the eye with the spectral sensitivities of the light receptors. Color categories and physical specifications of color are also associated with objects, materials, light sources, etc., based on their physical properties such as light combination, reflection, or emission spectra.

Typically, only features of the composition of light that are measurable by humans wavelength spectrum from 400 nm to 700 nm, roughly are included, thereby objectively relating the psychological phenomenon of color to its physical specification. Because perception of color stems from the varying sensitivity of different types of cone cells in the retina to different parts of the spectrum, colors may be defined and quantify by the degree to which they inspire these cells. These physical or physiological quantifications of color, however, do not fully clarify the psychophysical perception of color appearance